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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Accounts payable $ 3,386 $ 4,893
Accrued research projects 6,193 6,194
Accrued compensation and benefits 3,147 4,955
Accrued professional fees and other 767 839
Total $ 13,493 $ 16,881